| With the development of the mobile Internet, more and more enterprises deploy their own remote office systems. Remote mobile office system can allow outside employees to establish a virtual private network using the SSL VPN technology to access company intranet resources anytime, anywhere. The birth of the Android system promotes further the development of the mobile Internet.Currently on the market, there are secure access products combined with the Android system and SSL VPN technology. However, due to a congenital defect of traditional SSL VPN and the lack of research on the Android system, these products have certain security risks and problems in regardless of system functions or product performance.As the above analysis, there are security problems in traditional SSL VPN products, the paper first proposed and designed based a new SSL VPN solutions based on multi-factor authentication. Then on the basis of the analysis communication mechanism between an application and another and the packet processing, the paper focused on the structure of the SSL processing module in the application layer, the process of packet processing and IP fragment technology in client implement. The paper analysed the security of the existing SSL protocol, and then proposed an improved design, that is PKI-based SSL protocol. Finally, the paper studied deeply the Android system architecture and application layer software interface, and designed and implemented a VPN client based on the Android system. Then we did a client delay and throughput test, whose analysis showed that the VPN client can meet the application needs of the information security access the platform. Research and Implementation of the VPN client based on the Android system will vigorously promote the development of secure mobile Internet based on the Android system and provide a great convenience and security for remote mobile office, which has a strong theoretical and practical significance. |
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